Combined burglar-alarm and telephone system.



v v J.; eruomm. v COMBINED BURGLAR ALARM AND TELEPHONE SYSTEM APPLICATION TILED MAY 23, 1907.

' Patented Jan. 11, 1910.

m1 "Tun STATES PATENT o ron.-

JAMES G. NOLEN; OF CHICAGO, ILLINOI IS, ASSIGNORTO JOH N E. SHEPHERD, CHICAGO, ILLINOIS.

COMBINED BURGLAR-ALARM AND TELEPHONE SYSTEM.

Specification of Letters Patent.

Application filed May -23, 1907. Serial No. 3753M.

To all whom it may concern:

'Be it known that 1, JAMES citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Combined Burglar- Alarm and Telephone Systems, of which the following is a specificati0n.

v My invention relates to improvements in combined burglar alarm and telephone systems, and has for its object to provide sim ple'means for association with a telephone system and for occasioning the automatic transmission to the central station of an alarm signal of a character audible in the central station -operators receiver, in the; event of the operation of the signal initiating devices associated with the protective or burglar alarmcircuit.

A more particular object of my invention is to provide a system of the character described in which the alarm devices responsive to the action of the si 'nal initiatin devices,\are self-operating electrical appliances, such as relays or buzzers', which have the efiect of producing in'the line variations of the electrical conditions-such as to result in audible sounds in the operators receiver.

Other and further objects of my invention will beeome'apparent to those skilled in the art from the following description taken in conjunction with the accompanying draw- I ing, which illustrates diagrammatically in a single figure a party line system involving several party stations differently equipped, butall in accordance with my present in vention.

In said figure, land 2 of a party line, at the central station equipped'with conventional operating appliances including the jack J, whereof the tip contact j is connected with the line 1 and sleeve contact j is connected with line 2, the test ring 3' ofsuch "jack having connections to ground through the line cut-out relay Z0 1" and terminating at one terminal of central battery B, the opposite terminal of which is grounded at G and connected to the line wire 2. The line signal relay Z s r includes an armature connected with the line 2 between the relay and the battery andthe' front contact of such armature is connected 'through the'line signal'ts tofground. It

will befapparent; that my invention 1s-not..

which per se I limited in this construction,-

G. NoLnN, a

indicate line wires forms no part of the present-invention,'but

is illustrated as typical-of an operative ar rangelnent only.

The centralcord circuit and appliances maybe of conventional type, those showninvolving the tip strand'w sleeve s'trand'y and test strand a, a suitable plu'g P having its several contacts 2, p and. p connected with" 'the appropriate strands, a supervisory signal s, a supervisory relay 8 r, and operators. set whereof 0 ris the receiver. In the particular arrangement shown, the grounded terminal of the battery is connected through a repeating coil winding with the sleeve strand 3 which also;includesthe windingo'f the supervisory relay 8 1', controlling :1 normally open'shunt connection around the su-: pervisory signal 3 which is included 'inthe test strand; 2, side of the central battery. Said ungrounded side of the central battery has also directconnection through the repeating coil windings with the-tip p of the plug P and the operators receiver am is adapted to be bridged through a suit-able condenser across the tip and sleeve strands a; and It will Patent-ea Jan.,11, 1910; 1

connected to the. ungrounded be understood that'- the cord circuit ,arg. a

vrangement isalso conventional, andfo'rmsno part of my invention, and is shown for illustration only and not-by Way of limita-' tion. I" w The usual selective ringing apparatus may be associated with the cord strand-in conventional manner, not shown;

At each'of the subscribers stations A, B, and C, is provided a cust'omaryfset, preferably connected for ground ringing, such set involving a transmitter t, connected to line I,

a switch-hook h connected t'o linefi' and a' grounded bell b. 1 v

1 \Vith ,each subscrijbers set is. associated "a protective system involving signal. initia t in'g devices soarranged that when. operated they maycircuit including, the ;line and a source of current supply, line lamp is operated, and-preferably so connected with the line that should thefcentral:

signal lamp Z. '8

station cord circuit have been previously con lin'e when" nected with the jack or the party I a protective device at any subscriloefs sta 'tion is operated the supervisoryirelay is actuated to occasion the functional operation of the supervisory signal .8. As apart of such protective system-there is. also aseo occasion the establishment-eta so that the ciated with each subscribers set apparatuswhich automatically causes changes of electrical conditions in the line so as to produce 'audible results inthe receiver of the bodying my inve'ntion,..for the purpose of indicating that my invention may be vari ously embodied as to the constructions and connections of the signaling device, without departurefrom its spirit and scope, but not with a view to limiting my invention to the particular embodiments shown. In such illustration, the station A is provided with a grounded protective circuit wire 3 having connected therei in parallel signal initiating circuit closers 4, the wire 3 being connected to one 'terminal of a buzzer or relay coil 5, the opposite terminal. whereof is connected by wire (53 with a back c ntact 7 for the armature 8, which is also provided with another back contact 9 connected by wire 10 with the ordinary wiring of the siibscribers set between the transmitter t and the line-1. A front 2 contact '11, is further provided, which has hook,

connection through wire 12 with the switch and the armature is connected by wire 13 to the transmitter contact of the switch hook.' Now it. will be seen that whenever a slgnal initiating circuit-closer 4: is operated,

current flows from the grounded side of the central battery C B through the line signal relay Z s rand line 1 to the wire 10, thence through the armature 7 and connections 6, 5, 3 and 4 to ground, establishing a circuit including the relay winding 5 which at once attracts its armature, breaking said circuitand momentarily establishing a metallic circuit from the central battery through the line wire 1, transmitter t connection 13,"

armature 8, contact 11 and connection 12 to the line 2 and thence back to the central ,battery; This connection momentarily causes current to pass-through the transmitter, but

since the connection established excludes the coil 5 the armature falls back under the 1nfiuence of its customary spring, so that a Vibrator action is established and the transmitter is alternately cut into and out of circuit with the same effect so far as the line signal is concerned as if the receiver hook were rapidly vibrated. When the operator listens in she hears the characteristic vibration. It will be noticed, however, that if the party by wire 6 line he already in use at some other sub scribers station, so that the central cord circuit 1's connected with the jack J, then the operation of'the'signal initiator 4 establishes a ground circuit through the central battery C B, the tip strand w of the cord circuit, line wire 1 and connections 10, 9,-8, 7 6, 5, 4, 3, back to ground, such circuit excluding and practically robbing the sleeve strand of the cord circuit to the ground shunt, thereby causing the deenergizationof the supervisory relay s 1' the armature of which drops back breaking the shtint, which in the normal use of thetelephone is established around the signal 8 through such armature, and permitting the supervisory signal s to receive current through the path C B, cord strand 2, contacts p and 3', ground, and backto battery. Thus the supervisory signal" is lighted so long as the circuit just described remains established,

the line cutout relay,

but the vibrator action causing the constant making and breaking of said circuit occasions the rapid flashing of the supervisory lamp, which of itself is a signal readable by the central operator as a burglar alarm signal, and is confirmed when the central operator listens in and hears the buzzer.

In the arrangement shown' at station B, the supervisory wire 3 including in parallel therein the signal initiating devices 4: extends to one terminal of the relay winding 5, the other terminal of'which is connected customary set, connected to the tip wire 1 of the line. The armature 8 is connected as at 13' with the wire 8, and normally stands in engagement with the back contact 9 connected by wire 10' with the usual set between the transmitter and the upper switch-hook contact. The front contact 11 of the relay 5 is connected by the wire 12' with the wire 6. Now it will be seen that the closing 6 i a signal initiator closes the ground circuit establishing a grounded circuit for theline signal relay, or the supervisory relay, as the case may be, in part through the parallel paths afforded through the transmitter to wire 10, and armature 8', and in partthrough the wire 6 and winding 5, which when energized attracts armature 8 breaking ithe parallel leg of the circuit first described and closing a short circuit 12, 11, 8', 13, around the relay winding 5 so that the armature drops back and the vibrating action is thus set up. It will thus be seen that .the ground circuit established through the wire 3 is not broken as long as the sig nal initiator 4' remains closed, so that the line lamp or the supervisory signal, as the case resistances alternately cut into and cut 'of with the transmitter wire of the" the .stibscribers station .due'to.the action of the fthe groundedcircuits, cause a noise in the line which is readilv ecognizable by the centr-aloperator. i

Atthe su-bscrib'ers stationC still another form of wiring {is shown, wherein the grounded wire 3', including in'parallel the signalinitiators 4, exten'dsto one terminal of the relay 5" whose opposite terminal is wired as at 6 to the back contact 7 of the armature 8 having tail connection by wire x13" to the usual transmitter wire between the transmitter and the line; The front contact. 1-1 tor-the relay'is connected by wire 12 with theswitch hook h. It will be seen that closing of the signal initiator 4 results in a ground-return circuit includinga central battery,- the line signal-relay (or; the tip strand of-the cord, as. thecase may be) the line 'wirel and connections 13'., 8", 7", 6",

point 'll, 'tli'erebyestablishin'g a bridge 12", 11" 8",13." across the line wires, bridge'excluding'the transmitter.

It will be seen that with the arrangement shown at-A and C the ground connection inade'is not permanent, that, therefore, thesubscribers'bell inabe rung notwithstand=- 'ing the action oi' -tlierelay, as the bell re ceives current during-the intervals when the ground connection is broken by the relay.

lt-will further be seen that in any of the arrangements shown the central operator is invariably apprised of the actuation of a signal initiator, whether the line is already in use by some other Subscriber or not. In

case the line is not already in use the line lamp responds by flashing or' a constant glowing, to theoperation of the respective relays, and in the event the line is already in use and the cord circuit already connected with a partyline, the supervisory lamp is caused to glow. But even if the central op- I verator sliould misread the lighting of the one '45 supervisory lamp as a clearing-out signal,

' as soon as she pulled out the plug the line lamp would relight, and immediately upon her inserting the same or another plug the supervisory lamp would again light-conditions whiehca'n not prevail in the ordinary operation of a telephone system of the char acter hereinillustrativelyshown, and which,

therefore, apprises the operator at onceof the sort of signal being transmitted. The buzzers may obviously be of characteristic sounding qualities readily distinguishable.

While I have herein described in some detail several embodiments of my invention, it

will-be understood that many other changes in the wiring arrangement may readily .be 7 made without departure from the spirit and scope of my invention, and the various forms of wiring herein illustrated are shown merely as indicating that my invention is 3. 4: ba'ckto ground. -The armatureattracted and movedto make contact with such not in its broader aspect limited to any particular wiring diagram but may be variously embodied without departure from its spirit and scope.

Having thus described my invention, what I'claim; and desire to secure by Letters Patent, of the United States, is:

1. Ina combined telephone and protective vsystem, a party line circuit, a central station equipment, involving a line signal, a supervisory' signal and an operators receiver, a subscribers equipment at each partys station, a protective system at a partys station involving protective devices for establishing an energized circuit for actuating the line signal if the line is idle or the supervisory signal'if the line is busy, and means for automatically. making and breaking said circuit connections and with each break of said circuit establishing another circuit of different resistance, involving the line, thereby to occasion variations of electrical condi-.

tions in the line detectable in the central operators receiver.

2. In a'combined telephone andprotct ive system,- a line-circuit, a centraf station equipment involving a line signal and an operatorsreceiver, a subscriber s equipment involving a transmitter, and a protective-- system involving protective devices operable to csta'blish anj energized circuit connection for the line. signal, and a buzzer in a circuit controlled by said protective devices operable to make and break circuit connections for itself and the transmitter to occasion vibrations in the line detectable in the central operators receiver, controlled. by. 'the said protective device.

3. In a combined telephoneand protectw ive system, the combination of a line circuit .involving at central station a grounded battery, a line signal and a cord circuitincluding a supervisory signal and the operators receiver, and at the subscribers station 'in-.

volving a switch hook, of protective devices and a grounded protective circuit at the subscribers station, arranged when a protective device is operated to close a circuit proper to energize the line signal or supervisory-signal, and a self-actuating electro responsive instrument responsive to the closing ofsuch circuit to make and'break a bridge circuit across the lines,'for causing variations in the electrical conditions of the apparatus, and a cord "circuit including" said battery in bridged relation and providing a supervisory signal anda controlling device therefor in the grounded strand and break a circuit including the trans- 10 of the circuit; and a subscribers set involvmitter. ing a transmitter; of protective means at In testimony whereof I hereunto set my the subscribers station for establishing a hand in the presence of two Witnesses.

ground circuit excludin the transmitter T through the side of the 115% to cause the actu JAMES LOLEN' ation of theline signal or supervisory sig- In the presence ofnal, and a buzzer in said circuit arranged GEO. T. MAY, J

to respond to the closure thereof to make MA Y F. ALLEks 

